Simultaneous broadband and high circular dichroism with two-dimensional all-dielectric chiral metasurface.

ABSTRACT: Chiral metasurfaces have great potential in various applications such as polarimetric imaging and biomedical recognition. However, simultaneous broadband and high circular dichroism (CD) with high polarization extinction ratio (PER) remains a challenge. Here, we present a novel approach to realize simultaneous broadband and high CD with high PER in the optical communication band using a two-dimensional all-dielectric chiral metasurface. The structure is formed by a two-level chiral structure of split cross (first-order) and trapezoid-shaped (second-order) of Si nano ribs, respectively, in which constructively coupled first- and second-order of chirality occurs, resulting in the broad chiral response in the far field of multipoles excited by incident light of different chiralities. Theoreti

SUBMITTER: Wang R 

PROVIDER: S-EPMC11501280 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature